<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

	<script language="javascript" src="YMDClass.js"></script>
	<title>无标题文档</title>
</head>
<body>


	<p>年月日联动无初始值:<select name="year4"></select><select name="month4"></select><select name="day4"></select></p>

	<script>
		new YMDselect('year4','month4','day4');
	</script>
</body>
</html>